incrediBILL - 3:37 am on Mar 2, 2013 (gmt 0)
Right or wrong?
At this point it's neither, it's the status quo.
As long as the tools are there to let the webmaster manage control of content crawlers then I think it's a level playing field. However, when a search engine abuses the situation and ignores those controls like Google Preview does by not giving specific control over that specific screen shot feature it's pretty ugly. We should be able to disable just screen shots that theoretically can contain copyrighted images and other information that aren't intended to be indexed or displayed outside of the website but the only alternative is to use NOSNIPPET which completely removes all information from the list.
That's where legislation would be useful to force them stop blackmailing us to have image copyrights violated at the expense of participation in the index itself. Funny how you can also have NOARCHIVE which disables page cache which would be more appropriate to disable the page preview as well since they're essentially the same thing but it doesn't work that way.